I have used the NIDSA-4552 out of LabVIEW for a while, and it would occaisionally hang during a long run (a couple of hours). Sometimes, I could exit LabVIEW and test and run the card from MAX. If this didn't work, I could shut down and restart, and everything would work again. Now, however, if I use MAX, the test panel will come up, there are no resource conflicts, but it hangs the system when I try to acquire. If i use LabVIEW, the system hangs on initialization of the card. I am runing LabVIEW 6.0.2, NI-DAQ 6.9.2f8, and NI-DSA 1.11 under Windows 2K